Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

NPA: 603 [Rate centres in NPA 603] [Dial plan for NPA 603]

NXX: 451

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
603-451 A Concord NH DRRYNHBC1MD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122      
603-451 0 Concord NH MNCHNHNI9MD  6889 OMNIPOINT MIAMI E LICENSE, LLC 122      
603-451 1 Concord NH MNCHNHCOX9Z  637E ONVOY, LLC - NH 122      
603-451 2 Concord NH MNCHNHCOX9Z  637E ONVOY, LLC - NH 122      
603-451 3 Concord NH MNCHNHNI9MD  6889 OMNIPOINT MIAMI E LICENSE, LLC 122      
603-451 4 Concord NH MNCHNHNI9MD  6889 OMNIPOINT MIAMI E LICENSE, LLC 122      
603-451 5 Concord NH MNCHNHNI9MD  5562 METROPCS, INC. 122      
603-451 6 Concord NH MNCHNHBODS0  927H PEERLESS NETWORK OF NEW HAMPSHIRE, LLC - NH 122      
603-451 7 Concord NH DRRYNHBC1MD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122      
603-451 8 Concord NH DRRYNHBC1MD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122      
603-451 9 Concord NH DRRYNHBC1MD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 122      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.